Polishing mat



FIG. 1 is a perspective view of a polishing mat showing our new design;

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a left-side elevation view thereof.

FIG. 5 is a right-side elevation view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

Those features shown in broken lines form no part of the claimed design. 

CLAIM We claim the ornamental design for a polishing mat, as shown and described. 